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Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Available-for-sale | Fixed maturities    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets $ 378.8 $ 412.2
Total realized/unrealized gains (losses) included in net income, assets (0.2)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.9) 4.4
Net purchases, sales, issuances and settlements, assets 19.0 22.5
Transfers into Level 3, assets   19.5
Transfers out of Level 3, assets (4.0) (62.1)
Ending balance, assets 392.7 396.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.2) (0.1)
Gross purchases, sales, issuances and settlements    
Purchases, assets 40.6 39.1
Sales, assets (9.3) (3.6)
Settlements, assets (12.3) (13.0)
Net purchases, sales, issuances and settlements, assets 19.0 22.5
Available-for-sale | Non-U.S. governments    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 79.1 38.7
Total realized/unrealized gains (losses) included in net income, assets (0.1)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets 2.5 0.3
Net purchases, sales, issuances and settlements, assets 16.3 1.6
Ending balance, assets 97.8 40.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.1)  
Gross purchases, sales, issuances and settlements    
Purchases, assets 16.7 1.9
Settlements, assets (0.4) (0.3)
Net purchases, sales, issuances and settlements, assets 16.3 1.6
Available-for-sale | Corporate debt securities    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 223.9 245.6
Total realized/unrealized gains (losses) included in net income, assets (0.1) (0.1)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (2.6) 3.7
Net purchases, sales, issuances and settlements, assets 3.2 16.0
Transfers into Level 3, assets   19.5
Transfers out of Level 3, assets (1.7) (47.7)
Ending balance, assets 222.7 237.0
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.1) (0.1)
Gross purchases, sales, issuances and settlements    
Purchases, assets 23.9 27.1
Sales, assets (9.3) (3.6)
Settlements, assets (11.4) (7.5)
Net purchases, sales, issuances and settlements, assets 3.2 16.0
Available-for-sale | Commercial mortgage-backed securities    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 4.8  
Net purchases, sales, issuances and settlements, assets (0.1)  
Transfers out of Level 3, assets (2.3)  
Ending balance, assets 2.4  
Gross purchases, sales, issuances and settlements    
Settlements, assets (0.1)  
Net purchases, sales, issuances and settlements, assets (0.1)  
Available-for-sale | Collateralized debt obligations    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 63.5 64.2
Total realized/unrealized gains (losses) included in net income, assets   0.1
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.7) (0.1)
Net purchases, sales, issuances and settlements, assets   (0.6)
Ending balance, assets 62.8 63.6
Gross purchases, sales, issuances and settlements    
Settlements, assets   (0.6)
Net purchases, sales, issuances and settlements, assets   (0.6)
Available-for-sale | Other debt obligations    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 7.5 63.7
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.1) 0.5
Net purchases, sales, issuances and settlements, assets (0.4) 5.5
Transfers out of Level 3, assets   (14.4)
Ending balance, assets 7.0 55.3
Gross purchases, sales, issuances and settlements    
Purchases, assets   10.1
Settlements, assets (0.4) (4.6)
Net purchases, sales, issuances and settlements, assets (0.4) 5.5
Available-for-sale | Equity securities    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 4.1 4.1
Ending balance, assets 4.1 4.1
Trading | Fixed maturities    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 135.5 139.7
Total realized/unrealized gains (losses) included in net income, assets 0.3 0.7
Net purchases, sales, issuances and settlements, assets   (0.2)
Ending balance, assets 135.8 140.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 0.3 0.6
Gross purchases, sales, issuances and settlements    
Sales, assets   (0.2)
Net purchases, sales, issuances and settlements, assets   (0.2)
Derivative assets    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 47.2 53.7
Total realized/unrealized gains (losses) included in net income, assets 11.5 4.0
Net purchases, sales, issuances and settlements, assets 0.4 2.5
Ending balance, assets 59.1 60.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 11.4 4.2
Gross purchases, sales, issuances and settlements    
Purchases, assets   2.5
Sales, assets 0.4  
Net purchases, sales, issuances and settlements, assets 0.4 2.5
Other investments    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 35.1 127.2
Total realized/unrealized gains (losses) included in net income, assets 0.6 3.8
Net purchases, sales, issuances and settlements, assets 0.2 (67.4)
Transfers out of Level 3, assets   (35.0)
Ending balance, assets 35.9 28.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 0.5 3.8
Gross purchases, sales, issuances and settlements    
Purchases, assets 0.2 0.3
Sales, assets   (67.7)
Net purchases, sales, issuances and settlements, assets 0.2 (67.4)
Separate account assets    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 7,013.9 5,891.4
Total realized/unrealized gains (losses) included in net income, assets 152.9 215.7
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.1)  
Net purchases, sales, issuances and settlements, assets (73.0) (76.6)
Transfers into Level 3, assets 0.8 0.1
Ending balance, assets 7,094.5 6,030.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 147.6 198.5
Gross purchases, sales, issuances and settlements    
Purchases, assets 56.2 139.2
Sales, assets (60.7) (164.7)
Issuances, assets (92.8) (49.3)
Settlements, assets 24.3 (1.8)
Net purchases, sales, issuances and settlements, assets (73.0) (76.6)
Investment contracts    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, liabilities (177.4) (176.4)
Total realized/unrealized gains (losses) included in net income, liabilities (38.3) (51.0)
Net purchases, sales, issuances and settlements, liabilities 2.7 (1.3)
Ending balance, liabilities (213.0) (228.7)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (38.9) (52.1)
Gross purchases, sales, issuances and settlements    
Issuances, liabilities 1.1 (3.1)
Settlements, liabilities 1.6 1.8
Net purchases, sales, issuances and settlements, liabilities 2.7 (1.3)
Derivative liabilities    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, liabilities (50.5) (35.5)
Total realized/unrealized gains (losses) included in net income, liabilities 13.6 (15.8)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities 0.5 0.3
Net purchases, sales, issuances and settlements, liabilities 0.3 0.2
Ending balance, liabilities (36.1) (50.8)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 13.6 (15.8)
Gross purchases, sales, issuances and settlements    
Sales, liabilities 0.3 0.2
Net purchases, sales, issuances and settlements, liabilities 0.3 0.2
Other liabilities    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, liabilities (68.1) (66.3)
Total realized/unrealized gains (losses) included in net income, liabilities (5.0) 1.0
Ending balance, liabilities (73.1) (65.3)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities $ (5.0) $ 0.9